Rock-drill and like machine



G. CONSTANTINESCO. ROCK DRILL AND LIKE MACHINE.

APPLICATION FILED MAR. I2, I917.

Patented Man 23, 1920.

3 SHEETS-SHEET I.

G mye Constantine mow/vfiwo '75 G0 GU) G. CONSTANTINESCO.

ROGK DRILL AND LIKE MACHINE. APPLICATION EILED IIMLJZ, 1917.

Patented Mar. 23, 1920.

a SHEETS-SHEET 2.

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' Surrey, Englan UNITED s'rn'rns PATENT curios.

GEORGE GONSTANTINESCO, OF WEYIBBIDGE, ENGLAND, ASSIGN'OR 0F ONE-HALF 'I'O WALTER mnnon, or LONDON, E. c., ENGLAND.

noon-13311.1. Am) LIKE mncnmn.

To. all whom it may concern:

as (loco) Cous'rAurmEsco, a subject of the liing of Great Britain and Ireland, formerly a subject of the King of Roumania, residing at Carmen Sylva, Beechwoodavenue, Oatlands Park, We bridge, in the county of d (formerly residing at The Haddon Engineering Works, Honeypot Lane, Alperton, in the county of Middlesex, England, and formerly 'of Underall wood, 8 Lichfield road, Kew Gardens, London, W., England,) have invented certain new and use 111 Im rovements in Rock- Drills and like Machines, of which the following is a specification.

The present invention relates. to the application of methods of energy transmission by wave motion through liquids to machines such as rock drills or other reciprocating instruments of the kind described in my application Serial No. 24230, filed April 27th, 1915, of which this application is a division.

The invention consists in a method of op erating a rock; drill or like reciprocating instrument at a distance from the generator of power by periodic changes of pressure and volume in a liquid column between the generator and the instrument.

Referring to the accompanying drawings:

Figures 1 and 2 show a generator arranged to drive two rock drills mounted on suitable stands.

Fig. 3 shows a combined condenser and rock drill, while Fig. a is a section on the line t-i, 3.

Tu the plant illustrated the pump consists ot a piston 5i reciprocated by a crank shaft 552 at the speed of reciprocation equal to the period. of reciprocation desired tor the drills or other instruments. All very small valve 3% is provided leading from the chamber 35 to the cylinder of the pump and allowing a very small quantity oi water to i ilow into the pump chamber at each reciprocation ot the piston. This liow is extremely small in comparison with. the quantity of liquid which is displaced by the pump plunger. V

Liquid is pumped into the chamber 35 lay a small auxiliary pump from a store oi liquid contained in the vessel 33.. The level in the chamber 35 is kept constant by means oi the passage it? and non-return valve 32" Specification of Letters Patent.

Patented Mar. 23, 1920.

ori inal application filed April 27, 1915, serial No. 24,230. Divided and um application med umh 1a,

1917. Serial No. 164,249.

Connected to the pump there is a. pipe &0 leading to a large vessel tl having walls thick enough to be substantially rigid under the pressures used which vary. from say ten to .one thousand pounds per square inch above atmosphere with a mean pressure of about five hundred pounds per square inch. From the vessel e1 pipes 42, 43, lead to the drills 30, 31.

There is' a continuous column of liquid between the piston 51 and the piston 10 of the drill shown in Fig. 3. The drill comprises a piston 3 on which the liquid column acts. The liquid is admitted at 1 and when the pump is in operation causes ulsations to take place in the cylinder 2.

he working piston 3 is integral with the rifled extension 4, working in a ratchet device 5, 6. The member 5 carries a rifled bushing, and suitable teeth 7 engaging with similar teeth in the member 6. The member 6 is free to inove longitudinally in the direction of the axis of the piston, but is pre-- vented from revolving by longitudinal sliding keys 8. A spring 9 presses the part of the ratchet 6 against the part 5. When the rifled extension 4 moves longitudinally, it rotates the ratchet 5, but the form of the teeth 7 is such th'at'in one direction they hold together, but not in the other. a In this way on the down stroke of the piston the teetlrslip, and the piston does not rotate; while on the up stroke of the piston they bind together, and the piston rotates. The piston rod is thus rotated slowly in one direction, in order to turn the cutting bit.

The piston 3 is integral with the rod 10, sliding in the hushing ll. The chuck id at the The forward end oi the drill hody l? a stilt? spring 18 is provided, held hetween the flange it" and the bushing ll. The bushing it is free to slide longitudinally against the spring l8. The piston rod ltl carries a. llange Qll, supported by two springs 9ft, forming a condenser with the piston working the drill, the spring 21 lacing stronger than the spring 22, in order to provide for: the return strolre OT 'lflllfi piston when working.

The operation of the instrument is as tollows I;

inder walls 17, and through the annular space 16 and the passage 14 to the end of the drill bit. If Water is used in the system a continuous flow of water will thus be produced at the drill point. This play should not be excessive, so as to interfere with the workingrof the instrument.

The stance between the pump and the drills may be any convenient distance, for example, 500 feet. The drill illustrated, or other reciprocating percusive tool, is thus operated at the end of a long liquid column to which'a series of period c variations of volume and pressure are transmitted bv means of a pum as described in the British ,Letters Patent 1 o. 9029 of 1913 and 12438 of 1914, the power, being transmitted by a true wave motion which is made possible by reason of the elasticity of the liquid in the pipe. I

In the particular case illustrated in addition to the waves of pressure and volume there is also a slight flow of liquid continuously from the pump to the drills sufficient to provide a spray at the drill or drills for the pur ose of washing out the hole made in the roc and for cooling the tool. This flow, however, has nothing to do with the reciprocation of the moving part of the drill.

Having now described my invention, what I claim as new and desire to secure by Let ters Patent is 1. A method of operating a reciprocating instrument at a distance which consists in generating a series of periodic variations of pressure and volume in a single liquid column between the generator and the instrument, allowing these periodic changes of pressure and volume to travel along the liquid column and act on a strument, the time period of the periodic variations produced by the generator being equal to the natural, time period of reciprocation of the driven instrument, as set forth.

2. A valveless rock drill comprising in combination a piston, springs acting in opposite directions on said piston, and means including'a valveless pump and a transmission pipe between said pump and said drill for applying alternating liquid currents to said piston, said springs and the mass of said piston being such that the'natural period of vibration of the reciprocating part of said rock drill is equal to the time period of the alternating liquid currents impressed on the transmission line.

In testimony whereof I have name to this specification.

GOGU CONSTANTINESCO.

signed my piston in the reciprocating in- 

